A snapshot survey for gravitational lenses among z ≥ 4.0 quasars.: II.: Constraints on the 4.0 < z < 5.4 quasar population

被引：27

作者：

Richards, GT

Haiman, Z

Pindor, B

Strauss, MA

Fan, XH

Eisenstein, D

Schneider, DP

Bahcall, NA

Brinkmann, J

Fukugita, M

机构：

[1] Princeton Univ Observ, Princeton, NJ 08544 USA

[2] Columbia Univ, Dept Astron, New York, NY 10027 USA

[3] Univ Toronto, Dept Astron, Toronto, ON M5S 3H8, Canada

[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[5] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[6] Apache Point Observ, Sunspot, NM 88349 USA

[7] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

来源：

ASTRONOMICAL JOURNAL | 2006年 / 131卷 / 01期

基金：

美国国家科学基金会;

关键词：

early universe; galaxies : luminosity function; mass function; gravitational lensing; quasars : general;

D O I：

10.1086/498063

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on i-band snapshot observations of 157 Sloan Digital Sky Survey quasars at 4.0 < z < 5.4 using the Advanced Camera for Surveys on the Hubble Space Telescope (HST) to search for evidence of gravitational lensing of these sources. None of the quasars appear to be strongly lensed and multiply imaged at the angular resolution (similar to 0."1) and sensitivity of HST. The nondetection of strong lensing in these systems constrains the z = 4-5 luminosity function to an intrinsic slope of beta > -3.8 (3 sigma), assuming a break in the quasar luminosity function at M*(1450) similar to -24.5. This constraint is considerably stronger than the limit of beta > -4: 63 obtained from the absence of lensing in four z > 5.7 quasars. Such constraints are important to our understanding of the true space density of high-redshift quasars and the ionization state of the early universe.

引用

页码：49 / 54

页数：6

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A snapshot survey for gravitational lenses among z ≥ 4.0 quasars.: II.: Constraints on the 4.0 &lt; z &lt; 5.4 quasar population

A snapshot survey for gravitational lenses among z ≥ 4.0 quasars.: II.: Constraints on the 4.0 < z < 5.4 quasar population